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Manufacturer: Stanley Tools This is the short (approx 3.5 in long) screwdriver made by Stanley and numbered #2. It is sometimes called "Stubby". It is numbered 2712 and I have the patent information on the blade (patent # 250723), which was an improvement on the Phillips head.  
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| I will include the copy of the information I got from the patent office about the screwdriver tip. If you are an engineer or a tool maker,you will probably be able to understand it better tha I did. |
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